Jeep XJ. Manual — part 617
TEST
ACTION
APPLICABILITY
16
Turn the ignition on.
With the DRB III, select Engine and with the custom display feature select Low Idle
Switch input and the Accel Pedal %.
Slowly depress and release the accelerator pedal several times while monitoring the
DRB III display.
NOTE: The Low Idle Switch state should change between 5% and 10% of
Accelerator Pedal position.
Did the Low Idle Switch state change between 5% and 10% of Accelerator Pedal
position?
All
Yes
→
No
→
Replace the Accelerator Pedal Position Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
17
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running and at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
18
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Measure the voltage of the APP Sensor Signal circuit.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the APP Sensor Signal circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
120
DRIVEABILITY - DIESEL
P1515-ACCEL. PEDAL SENSOR PLAUSIBILITY —
Continued
TEST
ACTION
APPLICABILITY
19
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the APP Sensor Signal circuit and the Sensor
Ground circuits at cavity 4 and 8 of the APP Sensor harness connector.
Is the resistance below 10 kohms for any of the measurements?
All
Yes
→
Repair the APP Sensor Signal and Sensor Ground circuits for a
short together.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
20
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the APP Sensor Signal circuit.
Is the resistance below 10 kohms?
All
Yes
→
Repair the APP Sensor Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
21
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the APP Sensor Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the APP Sensor Signal circuit for an open
Perform ROAD TEST VERIFICATION - VER-2.
22
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
23
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Measure the voltage of the 5-volt Supply circuit in the ECM harness connector.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the 5-volt Supply circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
121
DRIVEABILITY - DIESEL
P1515-ACCEL. PEDAL SENSOR PLAUSIBILITY —
Continued
TEST
ACTION
APPLICABILITY
24
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the 5-volt Supply circuit and the Sensor Ground
circuits at cavities 4 and 8 of the APP Sensor harness connector.
Is the resistance above 100 kohms for both of the measurements?
All
Yes
→
No
→
Repair the 5-volt Supply circuit for a short to the Sensor Ground
circuit.
Perform ROAD TEST VERIFICATION - VER-2.
25
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the 5-volt Supply circuit.
Is the resistance below 10 kohms?
All
Yes
→
Repair the 5-volt Supply circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
26
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the 5-volt Supply circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the 5-volt Supply circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
27
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
122
DRIVEABILITY - DIESEL
P1515-ACCEL. PEDAL SENSOR PLAUSIBILITY —
Continued
Symptom:
P1520-VEHICLE SPEED GOV ANALOG CTRL - CONTROL CON-
TACT ALONE
POSSIBLE CAUSES
PERFORM SYMPTOM *CHECKING THE SPEED CONTROL OPERATION
INTERMITTENT CONDITION
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Turn the ignition off, wait 10 seconds, then turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Perform symptom *CHECKING THE SPEED CONTROL OPERATION in the
Symptom List.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
3
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Test Complete.
123
DRIVEABILITY - DIESEL
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